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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c577d399bde7eedf15abf6b2c2e2909061f7e74f7812a770f85cadfa86ab81be' 
  AND token = 'g+96AEc3S5WGvN84BoCQ/ztBeLa3bj6W161+KylaQrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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