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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e1cf164014f22e4ff464a5f8ced918da94a03243518856db92050598b62f4e2' 
  AND token = 'gXsueaU6N2fpjwo8ew+V1rnaQuRAL1mHBqRtYBCE+G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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