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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa6f8a05dfc4b334a3e2a317f4111f54f1f06273122fecb42712dd469533d7e' 
  AND token = 'mpAxOhOcyh6NEyk52DQuZOKn1Aqg176BlSOhY6ycKBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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