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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c2e2484505711f302359a9ecf7b39cd46df8450a6594abc6152c2a9ae4ebe07' 
  AND token = 'a1/R3+jqDN08pLvTysfunFPaEg+SaO9lfX+R+ABXNKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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