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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952cbca70e8f2da6c5c9dffb702bef9303fc0a8dc3ed7cbeb49e7d49e7698cfa' 
  AND token = 'tVM7gXAOU4zAH/MF4Nw9h7PL1TnlLgLycTvE3uxWito=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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