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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1313b58935820dad3c1baf8dc63eeb6725bf84c9bbdb584f941b8736cd71e3b6' 
  AND token = 'b22+2yVQsi/ruYQjMMnsJ/vMH+Sdni85LWuKx3sjykw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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