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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636e863257ec28092094e1b1b55374036bed917e19d313f76001dad415900308' 
  AND token = 'iLVjEr/Mi3s7X1G58J0hQc2GC2xItguEdZA87s+Mt8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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