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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30a56dd4555cde2fc5a9737eb9e694d39de6d4ed19f2db704aee47314770be22' 
  AND token = 'i1pqen+Uy/GaBXW3KENpSS0HsvYNBezm63sz4DosKZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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