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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11aaa8ff1ad19b70d8c47374397f139c09737d464757a9a280ef054ee11e035' 
  AND token = 'DIGL/ji46WkvAZ3r+UZkggb/B0chC7hDkbpC4wVHZ6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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