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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a079bbfb6d585f48dbfe7d62ac35267e6b4fc231a5d8155a0b9c8406f9ff9792' 
  AND token = 'Gl47Ny5S+uguD1Yl/01dToRWohZ7uCsg/qONRKky1iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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