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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e7d8ef3dc6006b6b85e3300e1620ae610918bb88824f1f6ebc88f32a09bcbd' 
  AND token = 'S3dQVyCDKL0rao+gGI6NKjck+Jy2ZQ29553jvVAsDKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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