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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e74b6ee7e158a1e4a301652aad465b870e7a2412477974c3b2fac3b5815d307' 
  AND token = 'lqRihX4bxlqYkaGuZ8yaaLtB8CmPd205J8ZYD964E6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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