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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2dcc534fff6304fabec6ef7cb2f9d82ffa0223986f8443282d3454105db6c8e' 
  AND token = '0gMGFiZXB5+Iv/EOm6C0N3RkAPRu+o4RbhgH5FR158E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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