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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e07d13db39592a5248e5e31dd897c7778d94e13e2ea772e6868442729c0d7d8' 
  AND token = 'ERk3xhs8ivKtaCPXVe6h7dCWLMwyE2LbKlCzdZNFXWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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