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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cab9e014b2e8fae18d358b68468f39a9b898ff1ce06b40b0d2878d39f2e3ee01' 
  AND token = 'FzT3XNwVM1oroTLyTr0LFWw+LQrRqUeOnKzORQHSFBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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