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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c02da1d7db265ca55cedd6e2edee0e92337020e0e162c4aa9dc8bddfd6d973' 
  AND token = 'AwX5UxtNon/HuEyDEdIVT3qs4uYzV89DzDpf81JtEoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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