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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692f2cd80104fa62b0f32a324377fffe66d82734704943350c0cc06b8b4c634e' 
  AND token = 'k6HN6jpG+t4b3k1wARARWlwf6jC4RZtAJvEfsOmr8Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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