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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960457823b776439bd660b937f6ff2ef0f2b63f4a2e8142a1f06ca0ca31b065d' 
  AND token = 's/zIv7CPsYrtusUzYVHGT5T2mRXDyt6czbBmFEKdHlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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