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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '881cd2cc59c0dfaf55bd5edfd14a278216169fac30aef98a9a2e7b614b0e6385' 
  AND token = '+bv132hR/V751dgrOcEz2cE82s9O3t+gAKjOKMHZuXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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