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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab050cf2e07abb6ec8fa4e6708d21f32875ea572b5b087ebca0ea2d73ba190c1' 
  AND token = 'jlEqOBilpNTFo9XhzEaBvkfjnAvb1IB/SKrs00NBHdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}