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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f69caaf38b73123fb0c2a0bad188e8c7eb14b1ef57f9c3cb207f9d93e832e5' 
  AND token = 'vFh/bWUpITOskcdnsHbOlCC97tyTy+vsmH2ydLQL7Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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