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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd48e250c32c52b6a2fbc3b8883c0857cc783fa73618d6b3a40de6acfb669ed' 
  AND token = 'WAxJ3dOxrIuSoOPwbqRSVxaVHopYEmkI5FNoXLzS4Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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