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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c8e200fd4af07215cc813a0b113eeee9918fe73b383cdb522038cb652f2a93' 
  AND token = 'ycu6NyDTugs9kNFv8NCM97+N/QFJb4FPr4fDOJ50HoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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