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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dbdac90c19ee4a8438cf26351d72183b3a3537780098b5827c389efda053535' 
  AND token = 'D1M7FTWimHFLs1NS2uvm2FH31aCSNOeg2uSEQe550Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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