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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b44c0593dcadb3e3658d1d5b53b515aa33df1114510644d057e6ba373791ca' 
  AND token = 'o1rpmq0jRg3SGSc0Ik6V2Sp7sY1itHET78pQO1iXbzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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