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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca832c20a86c98d25589240d88c07898e0820fed7a938452795da47c88df5941' 
  AND token = '3TputKuGv+oYSYNKbX5oMBXYP/FGENk3G646fPJy3ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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