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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4da17ce55b2e9bc2cb55683e545d5046b0537064a11118ae1d490754fea232' 
  AND token = '7LDMZkPHcen8LwA/hcBiv1t855AoqOufjqrga3oRh1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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