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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f67b45fc949c1b5dca6eb0fe30638b290e38441f70383cee01718be943d65628' 
  AND token = '57UR4PdZKqESvC6R/bOcZebpOb+y2n4HSsY2w15fBHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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