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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b2c8e3d8d29a7de3cdac83499af92151426bff4e911993d9adde24d71e1a1e' 
  AND token = 'QCrBXpi6XfEW+k34BrCcoylfaxLm/2lQqICdVuUtu58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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