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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98aa265bf652f87a67e0bdfec4731e25ff31a1eceff723bc8744a0051f5d7886' 
  AND token = 'bb7+4GW9hX2ycoQFSxXhwz3q4jI3WBFYmtgsK17be3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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