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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9487ecfbb21f4dd8b09abdad4371e4c53d92444792571818d010077dda2c3639' 
  AND token = 'HENn6IkYCJ4rLV7L+jfFHNOH3aKazzn0R+y+Wv0z1u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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