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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5358452f4dcb068d32c06bb71b6d14963b6a38ecd22486928758ac79d23c6701' 
  AND token = 'bKp8dd1/rRSOPMIf73VnUU4+zjN79ggI0VqUpLW2aQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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