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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c889091efb569c930318a2d8e6dc574e9c9eb2a157f90547dcf633b27cb339d0' 
  AND token = 'KRkr05CW6LbjAM0R6aMKlgJtnecNi4w860YGy4Oiljc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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