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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a2d8b1c1c52beb6b71f255aec518733440a6fcb278fd44748b618f8ef85aee5' 
  AND token = 'ehrwMhhxCPidddpnUjoBRDywhq5TEZlQ8vl+p188Tzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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