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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899371b4c7fb74d4a340d3c1c06e1d61e7953062ac963e395c382bd28ae6df20' 
  AND token = 'WOtfklYut9hX1DkC6vwfWa3t4+CG2BmIIyNJrIN/uLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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