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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5856f9c09bb5a1f5010de64ea9d0aaa927bad775733e7385696c6c849151e67c' 
  AND token = 'Cue5GfEKYflyebYVuk/19bRWd/oHCEQvYm+4Q0AnBFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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