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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7899fb475aa942ded6e018041aba746be4cfe7e15c3ef0a073ecaa869c3b0639' 
  AND token = 'CzVEFnqiR50Ewf4jRtZo2sx1+hzbQ+oE0lhuQKpRHWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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