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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b58a38440222ecea58161a64ae1816c96a1c04865e60bd03e45e254f9986d6' 
  AND token = 'ndpphWbsHUqmnxONBDJEoPSgtO7butufRIuMPTxtWYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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