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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e63400de85295ec5b143400104361e8fb69cdc02305c1e0ef901c62aa3ee807' 
  AND token = 'K7RNdKSq3KdmW0hiS7/vmThLAvqtsosyjgU3TdiCY2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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